Where do you bury the dead if a bus explodes on the border of the USA and Canada?

In a cemetery
Irrespective of where the bus exploded, the dead will be buried in a cemetery. It is also left for the family of the deceased to determine the location (country) and the day when the dead will be buried.

The family can choose to bury the dead in Canada or the US. The dead are not buried anywhere else except in the cemetery.
Hope this answer is of help to you.

In a coffin is an acceptable answer as it recognises the same intent as cemetery